What happens to your phones, devices when most 3G ceases in 2022?

https://www.newsweek.com/what-happens-your-phones-devices-when-most-3g-ceases-2 [login to see]
"Consumers with older cellphones like the iPhone 5 and Samsung Galaxy will likely soon lose the ability to send text messages, log on to the internet and even make phone calls, including to 911. The expiration date is fast approaching, as phase-outs will begin in early 2022."